Roof bow



FIG. 1 is a front plan view of a roof bow showing my new design;

FIG. 2 is an end view of the roof bow thereof;

FIG. 3 is a perspective view of the roof bow; and,

FIG. 4 is a top view of the roof bow.

In the drawings, the broken lines depict portions of the article thatform no part of the claim.

The ornamental design for a roof bow, as shown and described.